http://gcc.gnu.org/bugzilla/show_bug.cgi?id=52485
--- Comment #1 from Andrew Pinski <pinskia at gcc dot gnu.org> 2012-03-04 22:56:18 UTC --- I think we should not have an option to disable user-defined literals at all. Since their code is not C++11, they should fix their code to be C++11 if they use the -std=c++11/-std++0x option.